scootertrs

Hi. I own a 2002 2500hd extended cab, suicide doors, 8 foot bed pick-up. Truck runs great and looks OK but could look lots better with some improvements. I would like to...
1. Replace the seats (drivers is completely collapsed) console/jump seat ratty passenger and rear seats are ok.
2. Headliner (sagging)
3. Door seals (gone)
4. 8 foot bed (a lot of dings and crunches)
I would like to find compatible interior and bed from a later model truck, but cannot get any "real" info about which fits where. Ideally, I would like to go leather, but maybe out of $$$ reach. I would just be happy with being able to look out the windshield without standing on my toes. (and I am 6'3")
I can wrench (within limits) and am willing to modify a bit.
I would welcome any experiences other members have had.